Seems like ACAccountType needs a better isEqual: implementation

gistfile1.m

// Works fine

accounts = [accounts filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(ACAccount *evaluatedObject, NSDictionary *bindings) {
		return [[[evaluatedObject accountType] identifier] isEqualToString:[self.accountType identifier]];
}]];

// No dice

accounts = [accounts filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(ACAccount *evaluatedObject, NSDictionary *bindings) {
		return [[evaluatedObject accountType] isEqual:self.accountType];
}]];